Journal of Plant Growth Regulation

, Volume 31, Issue 4, pp 498–508 | Cite as

Synthesis of Iron-Amino Acid Chelates and Evaluation of Their Efficacy as Iron Source and Growth Stimulator for Tomato in Nutrient Solution Culture

  • Somayeh GhasemiEmail author
  • Amir H. Khoshgoftarmanesh
  • Hassan Hadadzadeh
  • Mehran Jafari


Supplying a sufficient amount of available iron (Fe) for plant growth in hydroponic nutrient solutions is a great challenge. The chelators commonly used to supply Fe in nutrient solutions have several disadvantages and may negatively affect plant growth. In this research study we have synthesized certain Fe-amino acid chelates, including Fe-arginine [Fe(Arg)2], Fe-glycine [Fe(Gly)2], and Fe-histidine [Fe(His)2], and evaluated their efficacy as an Fe source for two tomato cultivars (Lycopersicon esculentum Mill. cvs. ‘Rani’ and ‘Sarika’) grown in nutrient solution. Application of Fe-amino acid chelates significantly increased root and shoot dry matter yield of both tomato cultivars compared with Fe-EDTA. Tomato plants supplied with Fe-amino acid chelates also accumulated significantly higher levels of Fe, Zn, and N in their roots and shoots compared with those supplied with Fe-EDTA. In ‘Sarika’, the effect of Fe-amino acid chelates on shoot Fe content was in the order Fe(His)2 > Fe(Gly)2 > Fe(Arg)2. In ‘Rani’, the addition of all synthesized Fe-amino acid chelates significantly increased activity of ascorbate peroxidase (APX) in comparison with Fe-EDTA, whereas in ‘Sarika’, only Fe(His)2 increased shoot APX activity. The results obtained indicated that using Fe-amino acid chelates in the nutrient solution could supply a sufficient amount of Fe for plant uptake and also improve root and shoot growth of tomato plants, although this increase was cultivar-dependent. According to the results, Fe-amino acid chelates can be used as an alternative for Fe-EDTA to supply Fe in nutrient solutions.


Amino acids Chelate Fe availability Fe-EDTA Tomato 



This research was financially supported by Support Box of Iranian Researcher (Project No. 88002077).


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Somayeh Ghasemi
    • 1
    Email author
  • Amir H. Khoshgoftarmanesh
    • 1
  • Hassan Hadadzadeh
    • 2
  • Mehran Jafari
    • 3
  1. 1.Department of Soil Science, College of AgricultureIsfahan University of TechnologyIsfahanIran
  2. 2.Department of ChemistryIsfahan University of TechnologyIsfahanIran
  3. 3.Department of Horticulture, College of AgricultureIsfahan University of TechnologyIsfahanIran

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